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Old 05-20-2020, 05:49 AM   #1
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Top Down, 1-95 in Palm Beach... Cough Cough - Codes, Rough Idle, Erie Rattle

Sudden Check Engine Light, Codes, Rough Idle & Rattle Sound! What do you think is going on?

1999 Boxster 55,000 miles, mint condition as of last week.

So I'm cruising along I-95 in Palm Beach, top down, left lane... you know...looking awesome and I decided to get some gas. I pulled into Rac Trac and got 3/4 of a tank and hopped back on the highway. Within 2 minutes, back at highway speeds...

Engine light popped twice and the car coughed - lightly twice. I only had 3 miles to my exit, so I kept on going and she ran rough at the light on the exit ramp.

Ran rough for 5 more miles back to the beach. Pulled in and she's running rough and then you hear a rattle... like metal on metal rattle.

Codes from my blue tooth reader are...

P117 - Mass air flow sensor? or O2?
P1121 - Throttle posisiton sensor?
P0140 - O2 Sensor (Bank 1, Sensor 2)
P0304 - Cylinder 4 Misfire Detected

I'm a fair mechanic. The passenger seat needs a 25 year old unemployed waitress ass in it... asap. I have a few to choose from. How would you fix it - on the fast?


Last edited by 986Eve; 05-20-2020 at 08:18 AM.
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Old 05-20-2020, 08:38 AM   #2
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HELP? Kindly, spoon feeding is okay. Really, I need all the advice I can get. The o2 sensor code was existing. My main concern is piston 4 is damaged and compression has failed causing a lack of power. Hoping to follow the leader on this one...
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Old 05-20-2020, 08:58 AM   #3
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Pull the #4 plug and check its condition. If it's fouled, clean it up and replace. Swap the coil to another cyl. Clear the codes. Start it up and see if the misfire is still there. Check the codes. If the misfire code has moved to the cyl with the #4 coil now on it, you've got a coil issue. If the misfire is still on cyl #4, you've got either a bad plug or bigger issues.
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Old 05-20-2020, 12:06 PM   #4
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Thank you Husker - I'll take a look. And update.

Quote:
Originally Posted by husker boxster View Post
Pull the #4 plug and check its condition. If it's fouled, clean it up and replace. Swap the coil to another cyl. Clear the codes. Start it up and see if the misfire is still there. Check the codes. If the misfire code has moved to the cyl with the #4 coil now on it, you've got a coil issue. If the misfire is still on cyl #4, you've got either a bad plug or bigger issues.
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Old 05-22-2020, 05:19 PM   #5
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Be nice if they put an access door... aka.. hood with this model. Will investigate tomorrow
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Old 05-22-2020, 07:59 PM   #6
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Originally Posted by 986Eve View Post
Be nice if they put an access door... aka.. hood with this model. Will investigate tomorrow
They do. But anyway, you access the spark plugs from the wheel well.

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